and Thirteenth Centuries. University of Toronto Press. pp. 168–169. Katrín Axelsdóttir (2005). "Gunnlaugur Leifsson og Ambrósíus saga" in Skírnir, Autumn 2005:337-349. ISSN 0256-8446 Oddr Snorrason (translated by Theodore M. Andersson) (2003). The Saga of Olaf Tryggvason. Cornell University Press. Simpson, Jacqueline (2004). "Olaf Tryggvason versus the Powers of Darkness" in The Witch Figure: Folklore Essays by a Group of Scholars in England, pp. 165–187. Routledge. External links Þorvalds þáttur víðförla 1210s deaths 13th-century Icelandic poets Icelandic writers Icelandic Benedictines Kings' sagas Skalds Year of birth unknown Icelandic male poets